[Bug libstdc++/81751] [5/6/7/8 Regression]__basic_file::sync() may flush _all_ files

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81751

Jonathan Wakely <redi at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
      Known to work|                            |3.4.2
            Summary|__basic_file::sync() may    |[5/6/7/8
                   |flush _all_ files           |Regression]__basic_file::sy
                   |                            |nc() may flush _all_ files
      Known to fail|                            |3.4.4, 5.4.0, 6.3.0, 7.1.0

--- Comment #8 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Fixed on trunk so far.